GAUGE DOES NOT SELF-CALIBRATE AT STARTUP
Does the unit have power and ground?
Apply 12V power to the 'B" terminal
Apply ground to the ground terminal
Gauge should power up and do a self calibration.
Probe the power and ground studs directly to rule out a wire or connetor issue
YES IT WORKS> DONE
NO I still have an issue: Call NVU tech team at 248-850-5482 have the code SMS216-2 available